/Engine/Source/Editor/SequencerCore/Public/MVVM/ViewModels/OutlinerViewModel.h
Get the single hovered model in the tree, possibly nullptr
[TViewModelPtr](API\Editor\SequencerCore\TViewModelPtr)< [IOutlinerExtension](API\Editor\SequencerCore\MVVM\Extensions\IOutlinerExtension) > GetHoveredItem() const